11.45 mpg in town 16.847 mpg hwy..what's wrong!!
 

I've owned my 03 for a short period of time, when I first got it I was seeing mid 20s on the highway and 17 around town my milage has dropped horribly I've got an air dog pump just put new filters on 500 miles ago air filter was blown out a few weeks ago, no codes no leaks I can seem to find it gets the same milage with the tuner on or off, what the heck is going on!?!?#?#?#?#

Please tell us what tuner and other mods you have. Did it start doing this after the last PM that was done? Is the truck running rough?
Welcome to DB :tu:

It's got a 3" leveling kit, bully dog rfi, quadzi ll xzillaraider 2 programmer 4" straight pipe to 8 inch stack and yes it was not long after the filter change I noticed it, not sure what to do and thank you for the welcome

Bumped this back up, anybody got any ideas?
Seems either the tuner isn't working or maybe a fueling issue like an injector.

Any smoke on start up in the morning? Any blow by? Could be a dead hole "melted Piston" That's worst case! Need more info to narrow it down!

No smoke and not a bit of blow by, starts normal, no noticeable loss in power. I'm stumpped

Anyone have any ideas?

The air dog may be putting more fuel in and your still getting full combustion possibly? The pump is the only thing i can think of.

What kind of boost are you seeing?

my boost still seems the same, at wide open i see 40psi and my usual commute it is at 0 just farting along at 30 at 45 it varies but usually under 15psi